1 . 听下面一段对话，回答下列三个小题。
1. How long is the Great Wall?

A．Less than 10, 000 kilometers.

B．About 20, 000 kilometers.

C．More than 20, 000 kilometers.

2. How did the girl like the ancient people?

A．They are smart.

B．They are stupid.

C．They are strong.

3. Which is the possible relationship between the two speakers?

A．Brother and sister.

B．Classmates.

C．Guide and visitor.

2 . 听独白，回答以下各小题。
1. Who do you think the speaker is?

A．A scientist.

B．A teacher.

C．A radio reporter.

2. What does the speaker talk about?

A．Plant.

B．DNA.

C．Beauty.

3. How can you change the color of cotton according to the speaker?

A．By planting more cotton.

B．By making cotton into clothes.

C．By changing the DNA of cotton plants.

3 . 听下面一段对话，回答下列两个小题。
1. Where are the two speakers?

A．In a museum.

B．In a shoe shop.

C．In a supermarket.

2. What was the invention used for?

A．Holding water.

B．Holding wine.

C．Predicting earthquakes.

4 . 听下面一段材料，回答下列小题。
1. Which countries are apples mainly produced?

A．China, France, and the United States.

B．China, and the United States.

C．France and the United States.

2. Which kind of apples are the largest?

A．Red apples.

B．Green apples.

C．Delicious apples.

3. Which kind of apples are eaten fresh?

A．Red apples.

B．Sweet apples.

C．Green apples.